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View of the suit's pressure relief valve.

Picture 2 of 2.

While it is true that the earlier A7L suit had its relief valve on the left wrist, the A7LB had this valve relocated to the right thigh.

A7LB suits had the suit's pressure gauge relocated from the right wrist on the A7L suit to the left wrist. Indeed, Cernan's Apollo 17 suit worn on the lunar surface does show a pressure gauge on the left wrist.